THERMAL SCIENCE
International Scientific Journal
HEAT TRANSFER AND PRESSURE DROP EVALUATION OF DIFFERENT TRIANGULAR BAFFLE PLACEMENT ANGLES IN CROSS-CORRUGATED TRIANGULAR CHANNELS
ABSTRACT
Plate heat exchangers have a widespread usage and the simplest parallel plate channel structures. Cross-corrugated ducts are basic channel geometries used in the plate heat exchangers. In this study, the increasing of heat transfer from the cross-corrugated triangular ducts by inserting triangular baffles with different placement angles into the channel upper side and pressure drop have been numerically investigated. Numerical calculations have been carried out to solve Navier-Stokes and energy equations by employing k-ε turbulence model as 3-D and steady with ANSYS-FLUENT program. While inlet temperature of the air used as working fluid is 293 K, constant surface temperature values of the the lower corrugated channel walls are 373 K. The height of the baffle and apex angle of the corrugated duct have been taken constant as 0.5 H and 60°, respectively. Investigated Reynolds number range is 1000-6000 while the baffle placement angles are 30°, 45°, 60°, and 90°. Numerical results of this study are within 3.53% deviation with experimental study existed in literature. The obtained results have been presented as mean Nusselt number temperature and pressure variations of the fluid for each baffle angle. The temperature and velocity vector contour distributions have been also assessed for different Reynolds numbers and baffle angles. The value of the Num for the corrugated channel with 60° baffle angle is 8.2% higher than that of the 90° for the Re = 4000. Besides, for Re = 1000 the value of the pressure drop is 39% lower in the channel with 60° baffle angle than that of 90°.
KEYWORDS
PAPER SUBMITTED: 2019-08-13
PAPER REVISED: 2019-12-14
PAPER ACCEPTED: 2019-12-18
PUBLISHED ONLINE: 2020-01-04
THERMAL SCIENCE YEAR
2020, VOLUME
24, ISSUE
Issue 1, PAGES [355 - 365]
- Focke, W. W., Knibbe, P. G., Flow Visualization in Parallel-plate Ducts with Corrugated Walls, Journal of Fluid Mechanics, 165 (1986), pp. 73-77.
- Han, X. H., et al., A Numerical and Experimental Study of Chevron, Corrugated-Plate Heat Exchangers, International Communications Heat and Mass Transfer, 37 (2010), 8, pp. 1008-1014.
- Liu, X. P., Niu, J. L., Effects of Geometrical Parameters on the Thermohydraulic Characteristics of Periodic Cross-Corrugated Channels, International Journal of Heat and Mass Transfer, 84 (2015) pp. 542-549.
- Sharif, A., et al., Comparative Performance Assessment of Plate Heat Exchangers with Triangular Corrugation, Applied Thermal Engineering, 141 (2018) pp. 186-199.
- Hall, D., et al., Determination of Mass Transfer Coefficient of a Cross-Corrugated Membrane Reactor by the Limiting-Current Technique, International Journal of Heat and Mass Transfer, 44 (2001), 12, pp. 2201-2207.
- Guo-Yan, Z., et al., Numerical and Experimental Study on the Heat Transfer and Pressure Drop of Compact Cross-Corrugated Recuperators, Journal of Heat and Mass Transfer, 136 (2014), 7, 071801.
- Handoyo, E.A., et al., Numerical Studies on the Effect of Delta-Shaped Obstacles' Spacing on the Heat Transfer and Pressure Drop in V-Corrugated Channel of Solar Air Heater, Solar Energy, 131 (2016) pp. 47-60.
- Leung, C., Probert, S., Forced-Convective Turbulent Flows Through Horizontal Ducts with Isosceles-Triangular Internal Cross-Sections, Applied Energy, 57 (1997), 1, pp. 13-24.
- Zhang, L., Numerical Study of Periodically Fully Developed Flow and Heat Transfer in Cross-Corrugated Triangular Channels in Transitional Flow Regime, Numerical Heat Transfer Part A: Applications, 48 (2005), 4, pp. 387-405.
- Liang, C.H., et al., Numerical Studies on the Effect of Baffle on the Heat Transfer and Flow in Cross-Corrugated Triangular Ducts, IOP Conference Series: Earth and Environmental Science, 238 (2019), 1, 012086.
- FLUENT User's Guide, Fluent Inc. Lebanon, Netherland, 2003.
- Scott, K., Lobato, J., Mass Transport In Cross-Corrugated Membranes and the Influence of TiO2 for Separation Processes, Industrial&Engineering Chemistry Research, 42 (2003), 22, pp. 5697-5701.
- Li, Z., Gao, Y., Numerical Study of Turbulent Flow and Heat Transfer in Cross-Corrugated Triangular Ducts with Delta-Shaped Baffles, International Journal of Heat and Mass Transfer, 108, (2017), pp. 658-670.